Move status and audit label constants to shared/constants/labels

STATUS_LABELS was defined in the server, AUDIT_LABELS and AUDIT_COLORS
in the client. Both layers now import from a single shared source.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/constants/labels.ts

@@ -0,0 +1,30 @@
+export const STATUS_LABELS: Record<string, string> = {
+  OPEN: 'Open',
+  IN_PROGRESS: 'In Progress',
+  RESOLVED: 'Resolved',
+  CLOSED: 'Closed',
+};
+
+export const AUDIT_LABELS: Record<string, string> = {
+  CREATED: 'created this ticket',
+  STATUS_CHANGED: 'changed status',
+  ASSIGNEE_CHANGED: 'changed assignee',
+  SEVERITY_CHANGED: 'changed severity',
+  REROUTED: 'rerouted ticket',
+  TITLE_CHANGED: 'updated title',
+  OVERVIEW_CHANGED: 'updated overview',
+  COMMENT_ADDED: 'added a comment',
+  COMMENT_DELETED: 'deleted a comment',
+};
+
+export const AUDIT_COLORS: Record<string, string> = {
+  CREATED: 'bg-green-500',
+  STATUS_CHANGED: 'bg-blue-500',
+  ASSIGNEE_CHANGED: 'bg-purple-500',
+  SEVERITY_CHANGED: 'bg-orange-500',
+  REROUTED: 'bg-cyan-500',
+  TITLE_CHANGED: 'bg-gray-500',
+  OVERVIEW_CHANGED: 'bg-gray-500',
+  COMMENT_ADDED: 'bg-gray-500',
+  COMMENT_DELETED: 'bg-red-500',
+};